James s



Patented Feb. 19, 1924.

UNITED STATES JAMES S. THOMPSON, OF PELHAM, NEW YORK.

BRAKE-SHOE MOLD.

Application filed July 20, 1923. Serial No. 652,770.

To all 'whom t may concern.'

Be it known that I, JAMES S. THOMPSON, a citizen of the United States,residing at Pelham, in the county of Westchester and State of New 'Yorinhave invented certain new and useful Improvements in Brake- Shoe Molds,of which the following is a specification.

This invention relates to the manufacture of brake shoes and moreparticularly to the mold in which the shoe is cast, and its object isbroadly to enable a plain brake shoe to be cast in a permanent mold, aswell, as it can be cast in a sand mold, and with the additionaladvantages of reduction in time and cost.

A further object of the invention is to enable a brake shoe to be castin a metal mold freed from the chilling effect which would result bycontact of the hot metal with the metal walls of the mold cavity.

A further object of the invention is to provide the mold cavity walls ofa metal mold with a refractory facing in a simple and economical mannerto enable the production of brake shoes in metal molds with asubstantially uniform texture throughout the body of the shoe.

In the accompanying drawings illustrating selected embodiments of theinvention Fig. 1 is a longitudinal sectional view showing a metal moldbody for making a brake shoe.

Fig. 2 is a transverse sectional view on line 2 2 of Fig. 1.

Fig. 3 is a view similar to Fig. 1 showing the mold cavity wallsprovided with a refractory coating,

Fig. 4 is a transverse sectional view on the line 4 4 of Fig. 3.

Referring to the drawings, 5 represents the drag and 6 the cope of ametal mold having a pouring gate 7 preferably located at one end. Thebrake shoe mold cavity 8 is formed principally in the drag, and it hasan end wall 9, a bottom wall 10 and side walls 11,V 11 for the end7wearing face and sides of the shoe. The cope is shaped complementary tothe drag and has a wall 12 forming the' top wall of the mold cavity andan end wall 13 forming the other end wall of the mold cavity. This moldcavity thus formed in the drag and cope will be shaped, of course, toproduce the type of yshoe desired, and to this end it may be changed asrequired. These walls of the mold cavity comprise sections of refractorymaterial which are suitably set in the metal drag and metal cope, andthe sections are sufficiently substantial to prevent the metal drag andthe metal cope from having a chilling effect upon the hot metal pouredinto the'mold cavity to form the body of the shoe. In Figs. 1 and 2 therefractory material is shown to comprise a channel section 14 seated inthe drag and providing the entire bottom wall 10 of the mold cavity.This section 14 has an upstanding end 15 providing the end wall 9 of themold cavity. The section 14 is also provided with upstanding sides 16,16, providing the side walls 11, 1 1 of the mold cavity. I prefer tomake this entire refractory section 14 with its upstanding end 15 andsides 16, 16 in one piece, because joints are thereby avoided and abetter casting is produced, but there may be conditions under which thissection, as well as other refractory sections, may be made up of severalparts and closely fitted or cemented together, and I propose to make therefractory material in this way whenever found desirable.

Refractory sections 17 and 18 are seated in the metal cope of the moldand extend from an opening 19 in the cope oppositely to provide parts ofthe top wall 12 of the mold cavity, and the section 18 has a dependingend 20 providing the end wall 13 of the mold cavity. The refractorysections 17, 18 are suitably shaped at 21 to form end stops at the backof the shoe.

The opening 19 in the `cope is of substantial size to receive a sandplug 22, which is preferably made in a holder or container 23, whichfits snugly in the opening 19. I provide the plug with one or morelooped wires 24 supported from a cross bar 25 at the top of the plug,and having their free ends projecting through the inner end of the plug.A steel lug 26, baked sand core 27 and a reinforcing back 28 areassembled as shown, and the lug and core are inserted in the sand plugwith the back in its proper position against the top wall 12 of the moldcavity, and then the ends of the wires 24 are twisted together beneaththe reinforcing back to secure the back in place in the mold cavity andthe lug and baked core in the plug. I have r better shown two loopedWires 2li suspended from a flat cross bar 25, Which rests upon the topof the plug including its holder, but these Wires may be differentlyarranged and supported, as found desirable, to better'satisfy differentconditions which may arise in casting shoes of other types or withdifferent reinforcing backs or diderent lugs.

Instead of employing the refractory sections 14, 17, 18 as shown inFigs. 1 and 2, lf may provide the Walls of the mold cavity in the metaldragand cope with a coating ofrefractory material in sections-29, 30 and31, so that all those portions of the mold cavity Walls formed by thesections 14, 17 and 18v in Figs. 1 and 2 are formed by the coatingsections 29, 30 and 31 in Figs. 3 and d. The construction of Figs. 1 and2 has the advantage of longer life over the construction of Figs. 3 andLi, but l believe that except for this the construction of Figs. 3 andlivvill produce equally good results as that oflligs;v 1 and@ Myinvention provides in a simple Way for' the manufacture of--bralre shoesin permanent molds of as good or better quality than correspond-ing.brake shoes made in sand molds, at much greater speed and at much lesscost; The refractory Walls of the mold cavi-ty prevent the metal dragand the'metalcope from chilling the hot metal poured into'the moldcavity, and they enable the uniform production of brake shoes ofA apredetermined texture at all times, and of a Auality, l believe', thancan be produced under corresponding. conditions in a sand mold. The sandplugv 22 permits the escape of gases therethrough during the castingoperation, and insures the production of shoes of uniforr'nV size; shapeand texture, free from deformations and blovvholes. ll prefer to makethis sand plug of relatively large sizev because it can be easilyhandled, it provides ample space to accommodate the lug and the bakedsand core, and it provides for a free escape of the gases. It Will benoted that except'for that partof the top Wall of the mold cavity whichis formed by thel sand core and the parts carried' thereby", allI theWalls of the mold* cavity are formedof refractory material, andtherefore the shoe casting is (protected throughout by refractorymaterial or its equivalent from the chilling effect which would resultby Adirect contact with the meta-l drag and the metal cope. Thisenables: me to produce a bralr'eshoe of superior texture and" qualityunder lconditions Which will greatly reducek thel cost 4of manufacture;

My invention can be employed for malring castings other than brakeslices and 1 consider myself entitled to malte all such changes in theformg.- constructionand ar'- rangementof'vparts as mayl befne'cessary ordesirable" for this purpesey and for making neeaaaa diderent kinds,shapes and sizes of brake shoes, which fairly -fall Within the scope ofthe following claims.

I claim:

1. A permanent mold for making castings, and comprising a metal draganda metal cope with a mold cavity formed therein, the cope having anopening communicating with the mold cavity, a sand plug seated in` saidopening and forming a part of the top Wall of the mold cavity, andsections of refractory material seated in the drag and in the cope andforming the remaining parts of the Walls of the mold cavity.

2. A permanent mold for making castings, and comprising a metal drag anda metal cope With a mold cavity formed therein, the cope having anopening communicating With the mold cavity, a sand plugseated in saidopening and forming a part of the top Wall of the mold cavity, sectionsof refractory material forming theVv remainder of thetop Wall and oneend Wall of the mold cavity, and a channel section of refractorymaterial'forming the bottom Wall and the sidevv'allsand the other endWall of the mold cavity.

8. A permanent mold for making castings, and comprising a metal drag anda metal cope with a` mold cavity formed therein, the cope having acentral opening communicating With the mold cavity, a sand plug seatedin said opening and forming a part of the top Wall of the mold cavity, asingle sectionofrefractory material forming the'bottom Wall, side Wallsand oneend Wall of the mold cavity, another section of refractory'material forming the other end Wall and extending tol the opening in thecope to form a part of the top Wall of the mold cavity, and anothersection of refractory material extending from the opening in the cope tothe first mentioned end Wall to form the remaining part of the top` Wallof the mold cavity.

et. A permanent mold for casting a brake shoe, and comprising a drag anda cope having a mold cavity therein, and an integral section ofrefractory material forming the bottom Wall of said mold cavity and eX-tending from end to end thereof.

5. A. permanent mold for casting a brake slice, and comprising a dragand a cope having a mold cavity therein, and an integral section ofrefractory material forming the bottom and side walls of said moldcavity and extending from end to end thereof.

6. A permanent mold for casting a brake shoe, and comprising a dragancha cope having a mold cavity therein, and an integral sectionof'refractory material forming the bottomv and one end Wall of said moldcavity.

7. A permanent mold for casting a brake shoe, and comprising a drag andacope having, a mold cavitrtherein, integrai section of refractorymaterial forming the g shoe, and comprising a drag and a cope having amold cavity therein, and an integral section of refractory materialseated in the drag and forming the bottom, sides and one end Wall ofsaid mold cavity.

9. A permanent mold for casting a brake shoe and comprising a drag and acope having a mold cavity therein, and an integral section of refractorymaterial Jforming the bottom wall of said mold cavity and extending fromend to end thereof, said cope having an opening therein and a sand plugin said opening.

JAMES S. THOMPSON.

